EP1452883A2 - Dispositif optique de transmission et de réception - Google Patents

Dispositif optique de transmission et de réception Download PDF

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Publication number
EP1452883A2
EP1452883A2 EP04001341A EP04001341A EP1452883A2 EP 1452883 A2 EP1452883 A2 EP 1452883A2 EP 04001341 A EP04001341 A EP 04001341A EP 04001341 A EP04001341 A EP 04001341A EP 1452883 A2 EP1452883 A2 EP 1452883A2
Authority
EP
European Patent Office
Prior art keywords
diffractive
carrier
elements
optical
optical elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04001341A
Other languages
German (de)
English (en)
Inventor
Werner Schuler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sick AG
Original Assignee
Sick AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sick AG filed Critical Sick AG
Publication of EP1452883A2 publication Critical patent/EP1452883A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers

Definitions

  • the invention relates to an optical arrangement with a plurality of Transmitting elements and / or receiving elements, a plurality of diffractive and / or refractive optical elements and an optics carrier for the diffractive and / or refractive optical elements.
  • Farther is the invention to a method for producing such optical arrangement directed.
  • Optical arrangements of the type mentioned are e.g. then used when a defined protection zone monitors the intrusion of objects must become.
  • Typical applications are light curtains, for example in automatic production plants that stop the production plant trigger when an object enters a protected area, to avoid personal injury or property damage.
  • An optical arrangement of the type mentioned is from the European Patent application EP 0 867 732 known.
  • the one described there Construction includes e.g. a variety of light-emitting transmission elements and light receiving elements, a variety of the Diffractive or refractive elements assigned to transmitting and receiving elements optical elements and a transparent front cover.
  • the one-piece structure of the windscreen and optical elements on the one hand the advantage of a simple and economical production method, on the other hand, it is still necessary to use the optical elements compared to the respectively assigned aperture or the assigned To adjust the tube precisely, which requires a disadvantageous assembly effort.
  • the one-piece structure of the windscreen and optical Elements have no advantages when used in certain applications no windshield is required in the area of the optical elements.
  • temperature fluctuations or aging processes can materials used result in an optical element relative to the assigned aperture or tube, so that the overall optical arrangement functions correctly can no longer be guaranteed.
  • the object of the present invention is an optical arrangement of the Provide the type mentioned, which is simple and economical Manufacturing of their individual components with little effort is mountable and in particular one compared to the state of the Technology has increased functional reliability. Furthermore, a procedure is said for simple, efficient and inexpensive manufacture and assembly of the mentioned arrangement can be provided.
  • the first-mentioned tasks are achieved by an arrangement according to the invention according to claim 1 and in particular by an optical arrangement solved that a plurality of transmission elements and / or receiving elements, a plurality of diffractive and / or refractive optical elements and an optics carrier for the diffractive and / or refractive has optical elements, the optics carrier aperture openings owns, in whose area the diffractive and / or refractive optical Elements by means of a spraying or casting process with the optics carrier are connected.
  • the latter task is accomplished by a method according to the invention according to claim 21 and in particular by a method of manufacture an optical arrangement of the type mentioned solved in which in a first process step, the optics carrier at least with diaphragm openings is provided and in a further process step the diffractive and / or refractive optical elements by means of a Injection or casting process in the area of the aperture with the Optics carrier can be connected.
  • the injection or casting process used for the production of the diffractive and / or refractive optical elements is used at the same time to establish a connection between the diffractive and / or refractive optical elements and the optics carrier, so that a separate work process for producing this connection is carried out here can be dispensed with economically. Since the aperture openings to be assigned to the diffractive and / or refractive optical elements are already formed in the optics carrier, the diffractive and / or refractive optical elements can be sprayed onto the optics carrier in such a way that the aperture openings or points in defined relationships to the aperture openings serve as reference points serve for the injection or casting process.
  • the diffractive and / or refractive optical elements are exactly aligned with the diaphragm openings without a separate work process being necessary for this.
  • the fixed connection created in the manner according to the invention between the diffractive and / or refractive optical elements and the optical support having the aperture openings ensures that there is no significant shift between the diffractive and / or refractive optical elements and the respectively assigned aperture openings due to temperature fluctuations and aging processes , so that in this respect an error-free function of the overall optical arrangement is ensured.
  • diffractive or refractive optical elements a beam shaping of the outgoing from the transmitting elements or radiation incident on the receiving elements.
  • They can be spherical or aspherical lenses, as cylindrical lenses or as Fresnel lenses be trained.
  • the multiple optical elements are not as a unit connected to each other, but individually arranged on the optics carrier there are no forces due to temperature changes can act between the different optical elements and on the other hand, the optical elements can be positioned as desired can.
  • the optical elements arranged individually on the optics carrier can be spaced from one another or adjoin one another.
  • the optical elements can at least ever an undercut made as part of the injection molding or casting process have, in which the edge of the associated aperture engages.
  • the optical elements can also have projections with undercuts which are produced in the course of the injection molding or casting process and into which the edges of additional fastening openings formed in the optics carrier engage. It is advantageous if each aperture opening is assigned a number of additional fastening openings, the additional fastening openings assigned to an aperture opening in each case being able to be arranged essentially equally distributed around this aperture opening in order to achieve a particularly stable fastening.
  • optical elements can vary and it is desirable to use one use only one type of optics carrier for as many applications as possible, it may make sense to use an optics carrier with a high number of e.g. to provide apertures arranged along a straight line. For example, all aperture openings can then be used for one application can be equipped with optical elements, whereas with others Use cases only part of the aperture, for example only every third aperture, provided with an optical element becomes. This makes it possible to store different types of optics carriers reduce to a minimum.
  • the optics carrier can also be useful for the optics carrier to be designed so that the aperture openings in it have been further developed into aperture tubes, so that the spray or Casting an exact positioning of the optical elements opposite this aperture tubes results.
  • the optics carrier is designed as a punched strip, because such an economical Manufacturing becomes possible.
  • the optics carrier In order for the optics carrier to be automatically equipped with optical ones It is to achieve elements with the highest possible positioning accuracy cheap, the optics carrier for this purpose in the edge area with recesses to provide the centering and alignment of the optics carrier in serve a spraying machine.
  • the optics carrier equipped with the optical elements can be designed as a rigid element or flexibly, in particular can be wound up.
  • a flexible design there is the advantage that the optics carriers required in each case are unwound from a roll and can be separated in the desired length.
  • the optics carrier it is also possible to design the optics carrier as a rigid, cut-to-length strip.
  • the transmitting and / or receiving elements of an arrangement according to the invention are usually attached to an electronics carrier that is rigid or can be flexible. These are preferably an electronics board. Typically, at least one is optical Element, an aperture or a tube and a transmission or Receiving element coaxially along the optical axis of the optical Elements arranged.
  • a continuous cast profile preferably made of aluminum, is suitable for this.
  • a U-shaped continuous casting profile can be used here.
  • the invention can be used in particular in the manufacture of light curtains come into use.
  • a pair of two optical arrangements according to the invention are used, of which one as a pure transmission arrangement and the other as a pure reception arrangement is constructed.
  • the sending and receiving arrangement are then mutually oppositely oriented so that the from the sending elements outgoing beams from the opposite receiving arrangement can be detected.
  • the present invention is also the Task based on a method for simple, efficient and inexpensive To provide manufacture and assembly of the arrangement mentioned.
  • Such a procedure can proceed as follows:
  • the optics carrier is at least joined Provide aperture openings.
  • This is preferably done through a stamping process, it being advantageous if through this Stamping process also of the optics carrier itself from a flat material is punched out. In the latter case, there is therefore one Punching process of the optics carrier including all necessary aperture openings, Fastening openings and recesses.
  • the diffractive and / or refractive optical elements by means of an injection or casting process in the Area of the aperture openings connected to the optics carrier. This can happen, for example, by the optics carrier in the area of the aperture and / or the mounting holes from both sides with a two-part Injection mold is enclosed.
  • the injection mold is designed so that the optical elements during injection in the desired shape and simultaneously with the optics carrier the aperture and / or the mounting holes are connected.
  • a strip-shaped optics carrier blank should be flexible and be available in a coiled form.
  • the optics carrier blank is then successively unwound and provided with the aperture openings, possibly also with fastening openings or recesses, by means of a periodically repeated punching process.
  • the optical elements in the area of the diaphragm openings are then injection molded onto the optics carrier by means of a periodically repeating injection or casting process.
  • the optics carrier strip processed in this way can either be rewound or separated in certain lengths in order to obtain the optics carriers that are ultimately used. It is also possible to divide the quasi-endless method described into several quasi-endless methods. For example, it can make sense to unwind the optics carrier blank, which is in the wound form, in a first quasi-endless process, provide it with all the necessary openings and cutouts, and then wind it up again. In a second quasi-endless process, the optical carrier prepared and rewound in this way can now be unwound again and provided with the optical elements by means of a spraying or casting process.
  • Fig. 1 shows a strip-shaped section of an optics carrier 10, the with a total of three circular, equidistant along a straight line arranged aperture 11 is provided.
  • the optics carrier 10 can be made of opaque material and in particular consist of metal or plastic.
  • each of the diaphragm openings 11 there are four additional fastening openings 13 equally distributed, which is used to attach the in Fig. 1 not shown diffractive and / or refractive optical Serve elements.
  • the cutouts 14 are in turn equidistant from one another arranged and are - based on the longitudinal axis of the Optics carrier 10 - in the middle between two diaphragm openings 11.
  • FIG. 2 shows the optics carrier 10 according to FIG. 1, but with diffractive ones and / or refractive optical elements 20.
  • the optical Elements 20 are each designed as circular lenses, the optical ones Axes with the centers of the circular apertures 11 coincide.
  • the four fastening openings assigned to an optical element 20 13 are of the respective optical element 20 as well covers the assigned aperture 11, so that fastening openings 13 and aperture 11 in Fig. 2 accordingly only are shown in dashed lines.
  • FIG. 3 shows how a diffractive or refractive optical element 20 molded onto an optics carrier 10 by means of an injection molding process becomes. You can see the upper 50a and the lower 50b injection mold, which together the aperture 11 and the mounting holes 13 enclose.
  • the material for a diffractive or refractive Optical element 20 is injected into the closed tool 50a, 50b.
  • the optical element 20 is with integrally molded, mushroom-shaped Provided extensions 21 which have undercuts 23 and which extend through the mounting holes. The edges of the Fastening openings 13 engage in the undercuts 23 mentioned so that the optical element 20 is firmly connected to the optics carrier 10 is.
  • FIG. 4 shows a diffractive or injection molded onto an optics carrier 10.
  • refractive optical element 20 In contrast to Fig. 3 is the optical Element 20 not only with extensions 21 formed thereon Undercuts 23 connected to the optics carrier 10. Rather is to the optical element 20 additionally through the aperture 11 mushroom-shaped spigot formed, in the undercut 22 engages the edge of the aperture 11, so the optical Fix element 20 even better on optics carrier 10.
  • Fig. 5 shows a schematic, without aperture and fastening openings illustrated optics carrier 10 with electronics carrier arranged underneath 30.
  • the width of the electronics carrier 30 is slightly less than the width of the Optics carrier 10.
  • the in the area of the marginal recesses 14 of the Optics carrier 10 trained tabs 15 are rectangular bent down and with its front end with the electronics carrier 30 soldered to the solder joints 40, so as a firm, immovable Establish connection between optics carrier 10 and electronics carrier 30. Instead of a solder connection, a snap connection could also be used become.
  • FIG. 6 shows the arrangement according to FIG. 5 in a sectional side view.
  • those arranged at the diaphragm openings 11 are shown in FIG. 6 diffractive or refractive optical elements 20, 26 and a Transmitting element 32 and a receiving element 34 are shown. Because of Clarity is the connection between optical elements 20 and Optics carrier 10 not shown.
  • the transmitting element 32 and the receiving element 34 are on the electronics carrier 30 each aligned to the optical axis of the associated optical element 20, 26 attached.
  • the transmission element 32 can be a any radiation source, in particular a light-emitting diode, an infrared transmitter diode or a laser diode.
  • the radiation can come from the transmitting element 32 are delivered either continuously or modulated.
  • the Receiving element 34 can be used as a light-sensitive semiconductor, for example designed as a photodiode, phototransistor or as a light-sensitive resistor his.
  • Fig. 7 shows a section through a U-shaped continuous casting profile 60, the both legs 61 are provided with inwardly opening holding grooves 70 are.
  • the holding grooves 70 is a unit consisting of an equipped Optics carrier 10 and an attached electronics board 30 inserted.
  • the optics carrier 10 projects laterally over the electronics board 30 out.
  • the protruding edges of the optics carrier 10 are in the holding grooves 70 introduced so that the entire unit 10, 30 in the continuous casting profile 60 is held.
  • the cover plate 80 In the area of the open side of the U-shaped continuous casting profile 60 is one provided transparent cover plate 80 for the radiation used, to protect the optical arrangement against environmental influences. at If required, the cover plate 80 can be made of an optical filter material consist.
  • FIG. 8 corresponds to the representation according to FIG. 7, however, the electronics board 30 projects laterally over the optics carrier 10 out. Accordingly, here is the unit from electronics carrier 30 and Optics carrier 10 on the protruding edges of the electronics carrier 30 in the holding grooves 70 of the continuous casting profile 60 are inserted and held therein.
  • each in a continuous casting profile 60 separate holding grooves to provide for the electronics board 30 and the optics carrier 10.
  • electronics board 30 and optics carrier 10 it is no longer necessary to have electronics board 30 and optics carrier 10 additionally connect with each other. Just a relative shift between electronics board 30 and optics carrier 10 along the longitudinal axis of the continuous casting profile 60 must be carried out by means of suitable mechanical measures be prevented.

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  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
EP04001341A 2003-02-26 2004-01-22 Dispositif optique de transmission et de réception Withdrawn EP1452883A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10308285A DE10308285A1 (de) 2003-02-26 2003-02-26 Optische Sende- und Empfangsanordnung
DE10308285 2003-02-26

Publications (1)

Publication Number Publication Date
EP1452883A2 true EP1452883A2 (fr) 2004-09-01

Family

ID=32748065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04001341A Withdrawn EP1452883A2 (fr) 2003-02-26 2004-01-22 Dispositif optique de transmission et de réception

Country Status (3)

Country Link
US (1) US6982839B2 (fr)
EP (1) EP1452883A2 (fr)
DE (1) DE10308285A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1770414A1 (fr) * 2005-09-28 2007-04-04 Sick Ag Agencement optoélectronique

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004046725B4 (de) * 2004-09-25 2007-08-09 Sick Ag Gehäuse für ein Lichtgitter
DE102005046478B4 (de) * 2004-09-30 2019-03-14 Omron Corp. Photoelektrischer Mehrstrahl-Sensor
DE102005004419A1 (de) * 2005-01-31 2006-08-03 Sick Ag Optoelektronischer Sensor
DE202005009517U1 (de) 2005-06-16 2005-08-25 Sick Ag Lichtgitter zur Vermessung eines Objekts
DE202011000876U1 (de) * 2011-04-14 2012-07-17 Sick Ag Optikmodul für ein Lichtgitter
US9689720B1 (en) 2015-03-27 2017-06-27 General Electric Company Reduced airborne contamination detector heads
US9482562B2 (en) * 2015-03-27 2016-11-01 General Electric Company Shielded radiation detector heads
US10761223B1 (en) 2019-02-13 2020-09-01 GE Precision Healthcare LLC Systems and methods for multiple detector heads in a single arm or housing
US11854377B2 (en) * 2021-08-30 2023-12-26 Banner Engineering Corp. Field installable light curtain side status module
CN116577836B (zh) * 2023-07-14 2023-09-15 济宁联威车轮制造有限公司 一种汽车零部件冲压钣金检测装置及检测方法

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Also Published As

Publication number Publication date
US6982839B2 (en) 2006-01-03
DE10308285A1 (de) 2004-09-09
US20040207933A1 (en) 2004-10-21

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